<template>
  <div>
    <!-- 面包屑首部导航 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>用户管理</el-breadcrumb-item>
      <el-breadcrumb-item>角色列表</el-breadcrumb-item>
    </el-breadcrumb>
    <el-card>
      <!-- 先来一行，再来一列，然后放按钮 -->
      <el-row>
        <el-col>
          <el-button type="primary">分配角色</el-button>
        </el-col>
      </el-row>
      <el-table :data="rolesList" border stripe>
        <!-- type = expand 是展开列 -->
        <el-table-column type="expand">
          <!-- 通过作用域插槽来拿到这行的数据 -->
          <template slot-scope="scope">
            <!-- row 行 -->
            <el-row
              :class="['bdbottom', index === 0 ? 'bdtop' : '', 'vcenter']"
              v-for="(item1, index) in scope.row.children"
              :key="item1.id"
            >
              <!-- col 列 -->
              <!-- 渲染一级权限 -->
              <!-- span 占5列 -->
              <el-col :span="5">
                <el-tag closable @close="removeRightById(scope.row, item1.id)">
                  {{ item1.authName }}
                </el-tag>
                <i class="el-icon-caret-right"></i>
              </el-col>
              <!-- 渲染二、三级权限，占19列 -->
              <el-col :span="19">
                <!-- 通过for渲染所有的二级权限 -->
                <el-row
                  v-for="(item2, index2) in item1.children"
                  :key="index2"
                  :class="['bdbottom', index === 0 ? 'bdtop' : '', 'vcenter']"
                >
                  <!-- 二级权限 -->
                  <el-col :span="6">
                    <el-tag
                      type="success"
                      closable
                      @close="removeRightById(scope.row, item2.id)"
                    >
                      {{ item2.authName }}
                    </el-tag>
                    <i class="el-icon-caret-right"></i>
                  </el-col>
                  <!-- 三级权限 -->
                  <el-col :span="18">
                    <el-tag
                      type="warning"
                      v-for="(item3, index3) in item2.children"
                      :key="index3"
                      closable
                      @close="removeRightById(scope.row, item3.id)"
                    >
                      {{ item3.authName }}
                    </el-tag>
                  </el-col>
                </el-row>
              </el-col>
            </el-row>
            <!-- 打印出所有数据 -->
            <!-- pre 输出成为json格式 -->
            <!-- <pre> {{ scope.row }}</pre> -->
          </template>
        </el-table-column>
        <!-- type = index 索引列 -->
        <el-table-column type="index" label="#"></el-table-column>
        <el-table-column label="角色名称" prop="roleName"></el-table-column>
        <el-table-column label="角色描述" prop="roleDesc"></el-table-column>
        <el-table-column label="操作" width="300px">
          <template slot-scope="scope">
            <!-- 通过size= 'mini' 使得图标变小一些 -->
            <el-button size="mini" type="primary" icon="el-icon-edit">
              编辑
            </el-button>
            <el-button size="mini" type="danger" icon="el-icon-delete">
              删除
            </el-button>
            <el-button
              size="mini"
              type="warning"
              icon="el-icon-setting"
              @click="showSetRightDialog(scope.row)"
            >
              分配权限
            </el-button>
          </template>
        </el-table-column>
      </el-table>
    </el-card>
    <!-- 分配权限对话框 -->
    <el-dialog
      title="分配权限"
      :visible.sync="setRightDialogVisible"
      width="50%"
      @close="setRightDialogClosed()"
    >
      <el-tree
        :data="rightList"
        :props="treeProps"
        show-checkbox
        node-key="id"
        default-expand-all
        :default-checked-keys="defKeys"
        ref="treeRef"
      ></el-tree>
      <span slot="footer" class="dialog-footer">
        <el-button @click="setRightDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="allotRights()">
          确 定
        </el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      // 用户列表
      rolesList: [],
      // 控制分配权限对话框的显示与隐藏
      setRightDialogVisible: false,
      // 所有权限列表数据
      rightList: [],
      treeProps: {
        // 显示的字段
        label: 'authName',
        // 嵌套关系
        children: 'children'
      },
      // 默认选中的节点的id值数组
      // 数组中添加三级权限的id
      defKeys: [],
      // 当前即将分配权限的角色id
      roleId: ''
    }
  },
  created() {
    this.getRolesList()
  },
  methods: {
    async getRolesList() {
      const { data: res } = await this.$axios.get('roles')
      if (res.meta.status !== 200) {
        return this.$message.error('角色列表获取失败')
      }
      // console.log(res)
      this.rolesList = res.data
    },
    // 根据id删除对应的权限
    async removeRightById(role, rightId) {
      // 返回值是promise，所以用await
      const confirmResult = await this.$confirm(
        '此操作将永久删除该权限, 是否继续?',
        '提示',
        {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }
      ).catch((err) => err)
      if (confirmResult !== 'confirm') {
        return this.$message.info('取消了删除')
      }
      const { data: res } = await this.$axios.delete(
        `roles/${role.id}/rights/${rightId}`
      )
      // console.log(res)
      if (res.meta.status !== 200) {
        return this.$error.message('删除失败')
      }
      this.$message.success('删除成功')
      // 刷新列表
      // this.getRolesList()
      role.children = res.data
      // console.log(role)
      // console.log(res.data)
    },
    // 展示分配权限的对话框
    async showSetRightDialog(role) {
      this.roleId = role.id
      const { data: res } = await this.$axios.get('rights/tree')
      if (res.meta.status !== 200) {
        return this.$message.error('获取权限数据失败')
      }
      // console.log(res.data)
      this.rightList = res.data
      this.$message.success('获取成功')
      // 递归获取三级节点的id
      this.getLeafKeys(role, this.defKeys)
      this.setRightDialogVisible = true
    },
    // 数组保存三级节点函数
    getLeafKeys(node, arr) {
      // 第三级节点没有children
      if (!node.children) {
        // 将节点加入到数组中
        return arr.push(node.id)
      }
      node.children.forEach((item) => {
        this.getLeafKeys(item, arr)
      })
    },
    // 监听分配权限对话框的关闭
    setRightDialogClosed() {
      this.defKeys = []
    },
    // 点击为角色分配权限
    async allotRights() {
      const keys = [
        // ...是拓展运算符，将两个数组链接在一起
        ...this.$refs.treeRef.getCheckedKeys(),
        ...this.$refs.treeRef.getHalfCheckedKeys()
      ]
      // console.log(keys)
      const idStr = keys.join(',')
      const { data: res } = await this.$axios.post(
        `roles/${this.roleId}/rights`,
        { rids: idStr }
      )
      // console.log(res)
      if (res.meta.status !== 200) {
        return this.$message.error('分配权限失败！')
      }
      this.$message.success('分配权限成功！')
      this.getRolesList()
      this.setRightDialogVisible = false
    }
  }
}
</script>

<style lang="less" scoped>
.el-tag {
  margin: 7px;
}

.bdtop {
  border-top: 1px solid #eee;
}

.bdbottom {
  border-bottom: 1px solid #eee;
}
// 纵向剧中对齐
.vcenter {
  display: flex;
  align-items: center;
}
</style>
